This International Standard cancels and replaces 2004's ISO 18044.
In our Standard Operating Procedures, I provide direct pointers to ISO 27035 as well as NIST's SP 800-61 rev 2.
Aligning your security incident management program with these two documents lends well to meeting security incident management components for ISO and or PCI compliance. You'll definitely need to validate (with evidence) that your related activities meet muster for the audits, but with well written SOPs, documented processes, good case management, and regular drills and exercises (practice). Remember, actual incidents don't count as exercises. :-) Conduct a drill-like activity on a quarterly basis if possible, report on it, and be sure to incorporate lessons learned.

"No battle plan survives contact with the enemy"...but you can definitely prepare.